Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Reexamination Certificate
1999-09-29
2001-08-21
Falik, Andy (Department: 3741)
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
Reexamination Certificate
active
06276403
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gripper weaving machine comprising a gripper which can be moved into and out of the shed and mounted to a rapier associated with guides which can be moved into and out of the shed through the warp sheet, and to guides for guiding a rapier.
2. Description of the Related Art
A gripper weaving machine of the above type is known from U.S. Pat. No. 5,183,084. Guide elements mounted in two rows are used to guide the rapier. The guide elements of the row facing the reed are mounted in a guide surface of the rapier. The guide elements of the row facing away from the reed are hook-shaped and enclose a side edge of the rapier. Such hook-shaped guide elements increase the danger of causing rupture of and/or damage to the warp threads when being moved into the shed and out again through the warp sheet.
SUMMARY OF THE INVENTION
The objective of the invention is to so design a gripper weaving machine and in particular, its guide elements such that the danger of the guide elements damaging the warp threads is substantially reduced.
This problem is solved by two guide surfaces on the underside of the rapier that are associated with the guide elements mounted in two rows wherein at least the segment of the guide elements passing through the warp sheet subtends at obtuse angles relative to the underside of the rapier at least in the vicinity of the rapier on the reed side.
As a result of the invention, the warp threads are stressed lower when the guide elements are moved into and out of the shed. This feature is most advantageous for warp threads having knots or nubs or other irregularities since the threads will slide along the guide elements without undue danger that they will snag on the guide elements.
Advantageously, and especially as regard to a maximally open shed, the guide elements will subtend at an obtuse angle on the side away from the shed relative to the warp sheet they have penetrated. As a result there is further reduction in the danger that the nubs or knots will snag, especially during the withdrawing motion from the shed as during closing which might damage the warps.
Preferably the upper edges of all guide elements will be in their positions below the surface of the underside of the rapier. The upper edges of all guide elements may then guide the underside of the rapier.
In another embodiment, a guide structure is located at least in the vicinity of the end of the rapier where the gripper is present and is guided by the guide elements. In a further design the underside of the rapier includes a guide structure at least in the vicinity of the end of the rapier where the gripper is located and is guided by the guide elements. In another design, a guidance part is mounted in the extension of the rapier in the vicinity of the gripper and is guided by the guide elements. This guidance part may include a guide structure that is guided by the guide elements. A guide structure affixed to the rapier and/or a guide structure of the rapier may be used in the extension of the guide structure of the guide. As a result, the gripper and/or the segment of the rapier in the region of the gripper may be guided transversely of the direction of motion of the rapier.
In the invention, guides to guide a rapier always includes at least two guide elements of which the upper edges are located in one plane and which are associated with two mutually parallel guide surfaces of the underside of the rapier.
REFERENCES:
patent: 3299911 (1967-01-01), Dewas
patent: 4977932 (1990-12-01), Pezzoli
patent: 5176185 (1993-01-01), Reheinganz et al.
Bacon & Thomas PLLC
Falik Andy
Picanol N.V.
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